Fix various PVC issues on GCP

ci_gcp/geotiff-pvc.yaml

@@ -5,7 +5,7 @@ metadata:
   labels: {}
 spec:
   accessModes:
-    - ReadWriteMany
+    - ReadWriteOnce
   resources:
     requests:
       storage: 1Ti

ci_gcp/shapefiles-pvc.yaml

@@ -5,7 +5,7 @@ metadata:
   labels: {}
 spec:
   accessModes:
-    - ReadWriteMany
+    - ReadWriteOnce
   resources:
     requests:
       storage: 2Gi

ci_gcp/values-mapcache.yaml

@@ -8,7 +8,7 @@ wms:
 cache:
   persistence:
     enabled: true
-    storageClass: "local-path"
+    storageClass: "standard"
     size: 2Ti
     cleanup:
       # every 6 hours